Phys. Rev. A 67, 012306 (2003) [7 pages]Optimal entanglement generation from quantum operationsReceived 14 May 2002; published 13 January 2003 We consider how much entanglement can be produced by a nonlocal two-qubit unitary operation, UAB—the entangling capacity of UAB. For a single application of UAB, with no ancillas, we find the entangling capacity and show that it generally helps to act with UAB on an entangled state. Allowing ancillas, we present numerical results from which we can conclude, quite generally, that allowing initial entanglement typically increases the optimal capacity in this case as well. Next, we show that allowing collective processing does not increase the entangling capacity if initial entanglement is allowed. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.67.012306
DOI:
10.1103/PhysRevA.67.012306
PACS:
03.67.-a
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